Hi Alex,
You're off to a good start for the troubleshooting.
You need to find connector C22 which is on the drivers side opening on the top feeding the tail gate wiper.
Look for 12V DC between the Black and Orange, and the Black and Yellow/White wires. That will determine if the fault is back at the switch or a fault with the harness or rear wiper.
My hunch is the ground lead is open, the ground "31/11" is up there at the top drivers side of the tailgate opening. Make sure it's a good connection.
Post back with your findings.
Good luck, Bill
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